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diff --git a/fs/ubifs/log.c b/fs/ubifs/log.c
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1/*
2 * This file is part of UBIFS.
3 *
4 * Copyright (C) 2006-2008 Nokia Corporation.
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 as published by
8 * the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * more details.
14 *
15 * You should have received a copy of the GNU General Public License along with
16 * this program; if not, write to the Free Software Foundation, Inc., 51
17 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18 *
19 * Authors: Artem Bityutskiy (Битюцкий Артём)
20 * Adrian Hunter
21 */
22
23/*
24 * This file is a part of UBIFS journal implementation and contains various
25 * functions which manipulate the log. The log is a fixed area on the flash
26 * which does not contain any data but refers to buds. The log is a part of the
27 * journal.
28 */
29
30#include "ubifs.h"
31
32#ifdef CONFIG_UBIFS_FS_DEBUG
33static int dbg_check_bud_bytes(struct ubifs_info *c);
34#else
35#define dbg_check_bud_bytes(c) 0
36#endif
37
38/**
39 * ubifs_search_bud - search bud LEB.
40 * @c: UBIFS file-system description object
41 * @lnum: logical eraseblock number to search
42 *
43 * This function searches bud LEB @lnum. Returns bud description object in case
44 * of success and %NULL if there is no bud with this LEB number.
45 */
46struct ubifs_bud *ubifs_search_bud(struct ubifs_info *c, int lnum)
47{
48 struct rb_node *p;
49 struct ubifs_bud *bud;
50
51 spin_lock(&c->buds_lock);
52 p = c->buds.rb_node;
53 while (p) {
54 bud = rb_entry(p, struct ubifs_bud, rb);
55 if (lnum < bud->lnum)
56 p = p->rb_left;
57 else if (lnum > bud->lnum)
58 p = p->rb_right;
59 else {
60 spin_unlock(&c->buds_lock);
61 return bud;
62 }
63 }
64 spin_unlock(&c->buds_lock);
65 return NULL;
66}
67
68/**
69 * ubifs_get_wbuf - get the wbuf associated with a LEB, if there is one.
70 * @c: UBIFS file-system description object
71 * @lnum: logical eraseblock number to search
72 *
73 * This functions returns the wbuf for @lnum or %NULL if there is not one.
74 */
75struct ubifs_wbuf *ubifs_get_wbuf(struct ubifs_info *c, int lnum)
76{
77 struct rb_node *p;
78 struct ubifs_bud *bud;
79 int jhead;
80
81 if (!c->jheads)
82 return NULL;
83
84 spin_lock(&c->buds_lock);
85 p = c->buds.rb_node;
86 while (p) {
87 bud = rb_entry(p, struct ubifs_bud, rb);
88 if (lnum < bud->lnum)
89 p = p->rb_left;
90 else if (lnum > bud->lnum)
91 p = p->rb_right;
92 else {
93 jhead = bud->jhead;
94 spin_unlock(&c->buds_lock);
95 return &c->jheads[jhead].wbuf;
96 }
97 }
98 spin_unlock(&c->buds_lock);
99 return NULL;
100}
101
102/**
103 * next_log_lnum - switch to the next log LEB.
104 * @c: UBIFS file-system description object
105 * @lnum: current log LEB
106 */
107static inline int next_log_lnum(const struct ubifs_info *c, int lnum)
108{
109 lnum += 1;
110 if (lnum > c->log_last)
111 lnum = UBIFS_LOG_LNUM;
112
113 return lnum;
114}
115
116/**
117 * empty_log_bytes - calculate amount of empty space in the log.
118 * @c: UBIFS file-system description object
119 */
120static inline long long empty_log_bytes(const struct ubifs_info *c)
121{
122 long long h, t;
123
124 h = (long long)c->lhead_lnum * c->leb_size + c->lhead_offs;
125 t = (long long)c->ltail_lnum * c->leb_size;
126
127 if (h >= t)
128 return c->log_bytes - h + t;
129 else
130 return t - h;
131}
132
133/**
134 * ubifs_add_bud - add bud LEB to the tree of buds and its journal head list.
135 * @c: UBIFS file-system description object
136 * @bud: the bud to add
137 */
138void ubifs_add_bud(struct ubifs_info *c, struct ubifs_bud *bud)
139{
140 struct rb_node **p, *parent = NULL;
141 struct ubifs_bud *b;
142 struct ubifs_jhead *jhead;
143
144 spin_lock(&c->buds_lock);
145 p = &c->buds.rb_node;
146 while (*p) {
147 parent = *p;
148 b = rb_entry(parent, struct ubifs_bud, rb);
149 ubifs_assert(bud->lnum != b->lnum);
150 if (bud->lnum < b->lnum)
151 p = &(*p)->rb_left;
152 else
153 p = &(*p)->rb_right;
154 }
155
156 rb_link_node(&bud->rb, parent, p);
157 rb_insert_color(&bud->rb, &c->buds);
158 if (c->jheads) {
159 jhead = &c->jheads[bud->jhead];
160 list_add_tail(&bud->list, &jhead->buds_list);
161 } else
162 ubifs_assert(c->replaying && (c->vfs_sb->s_flags & MS_RDONLY));
163
164 /*
165 * Note, although this is a new bud, we anyway account this space now,
166 * before any data has been written to it, because this is about to
167 * guarantee fixed mount time, and this bud will anyway be read and
168 * scanned.
169 */
170 c->bud_bytes += c->leb_size - bud->start;
171
172 dbg_log("LEB %d:%d, jhead %d, bud_bytes %lld", bud->lnum,
173 bud->start, bud->jhead, c->bud_bytes);
174 spin_unlock(&c->buds_lock);
175}
176
177/**
178 * ubifs_create_buds_lists - create journal head buds lists for remount rw.
179 * @c: UBIFS file-system description object
180 */
181void ubifs_create_buds_lists(struct ubifs_info *c)
182{
183 struct rb_node *p;
184
185 spin_lock(&c->buds_lock);
186 p = rb_first(&c->buds);
187 while (p) {
188 struct ubifs_bud *bud = rb_entry(p, struct ubifs_bud, rb);
189 struct ubifs_jhead *jhead = &c->jheads[bud->jhead];
190
191 list_add_tail(&bud->list, &jhead->buds_list);
192 p = rb_next(p);
193 }
194 spin_unlock(&c->buds_lock);
195}
196
197/**
198 * ubifs_add_bud_to_log - add a new bud to the log.
199 * @c: UBIFS file-system description object
200 * @jhead: journal head the bud belongs to
201 * @lnum: LEB number of the bud
202 * @offs: starting offset of the bud
203 *
204 * This function writes reference node for the new bud LEB @lnum it to the log,
205 * and adds it to the buds tress. It also makes sure that log size does not
206 * exceed the 'c->max_bud_bytes' limit. Returns zero in case of success,
207 * %-EAGAIN if commit is required, and a negative error codes in case of
208 * failure.
209 */
210int ubifs_add_bud_to_log(struct ubifs_info *c, int jhead, int lnum, int offs)
211{
212 int err;
213 struct ubifs_bud *bud;
214 struct ubifs_ref_node *ref;
215
216 bud = kmalloc(sizeof(struct ubifs_bud), GFP_NOFS);
217 if (!bud)
218 return -ENOMEM;
219 ref = kzalloc(c->ref_node_alsz, GFP_NOFS);
220 if (!ref) {
221 kfree(bud);
222 return -ENOMEM;
223 }
224
225 mutex_lock(&c->log_mutex);
226
227 if (c->ro_media) {
228 err = -EROFS;
229 goto out_unlock;
230 }
231
232 /* Make sure we have enough space in the log */
233 if (empty_log_bytes(c) - c->ref_node_alsz < c->min_log_bytes) {
234 dbg_log("not enough log space - %lld, required %d",
235 empty_log_bytes(c), c->min_log_bytes);
236 ubifs_commit_required(c);
237 err = -EAGAIN;
238 goto out_unlock;
239 }
240
241 /*
242 * Make sure the the amount of space in buds will not exceed
243 * 'c->max_bud_bytes' limit, because we want to guarantee mount time
244 * limits.
245 *
246 * It is not necessary to hold @c->buds_lock when reading @c->bud_bytes
247 * because we are holding @c->log_mutex. All @c->bud_bytes take place
248 * when both @c->log_mutex and @c->bud_bytes are locked.
249 */
250 if (c->bud_bytes + c->leb_size - offs > c->max_bud_bytes) {
251 dbg_log("bud bytes %lld (%lld max), require commit",
252 c->bud_bytes, c->max_bud_bytes);
253 ubifs_commit_required(c);
254 err = -EAGAIN;
255 goto out_unlock;
256 }
257
258 /*
259 * If the journal is full enough - start background commit. Note, it is
260 * OK to read 'c->cmt_state' without spinlock because integer reads
261 * are atomic in the kernel.
262 */
263 if (c->bud_bytes >= c->bg_bud_bytes &&
264 c->cmt_state == COMMIT_RESTING) {
265 dbg_log("bud bytes %lld (%lld max), initiate BG commit",
266 c->bud_bytes, c->max_bud_bytes);
267 ubifs_request_bg_commit(c);
268 }
269
270 bud->lnum = lnum;
271 bud->start = offs;
272 bud->jhead = jhead;
273
274 ref->ch.node_type = UBIFS_REF_NODE;
275 ref->lnum = cpu_to_le32(bud->lnum);
276 ref->offs = cpu_to_le32(bud->start);
277 ref->jhead = cpu_to_le32(jhead);
278
279 if (c->lhead_offs > c->leb_size - c->ref_node_alsz) {
280 c->lhead_lnum = next_log_lnum(c, c->lhead_lnum);
281 c->lhead_offs = 0;
282 }
283
284 if (c->lhead_offs == 0) {
285 /* Must ensure next log LEB has been unmapped */
286 err = ubifs_leb_unmap(c, c->lhead_lnum);
287 if (err)
288 goto out_unlock;
289 }
290
291 if (bud->start == 0) {
292 /*
293 * Before writing the LEB reference which refers an empty LEB
294 * to the log, we have to make sure it is mapped, because
295 * otherwise we'd risk to refer an LEB with garbage in case of
296 * an unclean reboot, because the target LEB might have been
297 * unmapped, but not yet physically erased.
298 */
299 err = ubi_leb_map(c->ubi, bud->lnum, UBI_SHORTTERM);
300 if (err)
301 goto out_unlock;
302 }
303
304 dbg_log("write ref LEB %d:%d",
305 c->lhead_lnum, c->lhead_offs);
306 err = ubifs_write_node(c, ref, UBIFS_REF_NODE_SZ, c->lhead_lnum,
307 c->lhead_offs, UBI_SHORTTERM);
308 if (err)
309 goto out_unlock;
310
311 c->lhead_offs += c->ref_node_alsz;
312
313 ubifs_add_bud(c, bud);
314
315 mutex_unlock(&c->log_mutex);
316 kfree(ref);
317 return 0;
318
319out_unlock:
320 mutex_unlock(&c->log_mutex);
321 kfree(ref);
322 kfree(bud);
323 return err;
324}
325
326/**
327 * remove_buds - remove used buds.
328 * @c: UBIFS file-system description object
329 *
330 * This function removes use buds from the buds tree. It does not remove the
331 * buds which are pointed to by journal heads.
332 */
333static void remove_buds(struct ubifs_info *c)
334{
335 struct rb_node *p;
336
337 ubifs_assert(list_empty(&c->old_buds));
338 c->cmt_bud_bytes = 0;
339 spin_lock(&c->buds_lock);
340 p = rb_first(&c->buds);
341 while (p) {
342 struct rb_node *p1 = p;
343 struct ubifs_bud *bud;
344 struct ubifs_wbuf *wbuf;
345
346 p = rb_next(p);
347 bud = rb_entry(p1, struct ubifs_bud, rb);
348 wbuf = &c->jheads[bud->jhead].wbuf;
349
350 if (wbuf->lnum == bud->lnum) {
351 /*
352 * Do not remove buds which are pointed to by journal
353 * heads (non-closed buds).
354 */
355 c->cmt_bud_bytes += wbuf->offs - bud->start;
356 dbg_log("preserve %d:%d, jhead %d, bud bytes %d, "
357 "cmt_bud_bytes %lld", bud->lnum, bud->start,
358 bud->jhead, wbuf->offs - bud->start,
359 c->cmt_bud_bytes);
360 bud->start = wbuf->offs;
361 } else {
362 c->cmt_bud_bytes += c->leb_size - bud->start;
363 dbg_log("remove %d:%d, jhead %d, bud bytes %d, "
364 "cmt_bud_bytes %lld", bud->lnum, bud->start,
365 bud->jhead, c->leb_size - bud->start,
366 c->cmt_bud_bytes);
367 rb_erase(p1, &c->buds);
368 list_del(&bud->list);
369 /*
370 * If the commit does not finish, the recovery will need
371 * to replay the journal, in which case the old buds
372 * must be unchanged. Do not release them until post
373 * commit i.e. do not allow them to be garbage
374 * collected.
375 */
376 list_add(&bud->list, &c->old_buds);
377 }
378 }
379 spin_unlock(&c->buds_lock);
380}
381
382/**
383 * ubifs_log_start_commit - start commit.
384 * @c: UBIFS file-system description object
385 * @ltail_lnum: return new log tail LEB number
386 *
387 * The commit operation starts with writing "commit start" node to the log and
388 * reference nodes for all journal heads which will define new journal after
389 * the commit has been finished. The commit start and reference nodes are
390 * written in one go to the nearest empty log LEB (hence, when commit is
391 * finished UBIFS may safely unmap all the previous log LEBs). This function
392 * returns zero in case of success and a negative error code in case of
393 * failure.
394 */
395int ubifs_log_start_commit(struct ubifs_info *c, int *ltail_lnum)
396{
397 void *buf;
398 struct ubifs_cs_node *cs;
399 struct ubifs_ref_node *ref;
400 int err, i, max_len, len;
401
402 err = dbg_check_bud_bytes(c);
403 if (err)
404 return err;
405
406 max_len = UBIFS_CS_NODE_SZ + c->jhead_cnt * UBIFS_REF_NODE_SZ;
407 max_len = ALIGN(max_len, c->min_io_size);
408 buf = cs = kmalloc(max_len, GFP_NOFS);
409 if (!buf)
410 return -ENOMEM;
411
412 cs->ch.node_type = UBIFS_CS_NODE;
413 cs->cmt_no = cpu_to_le64(c->cmt_no + 1);
414 ubifs_prepare_node(c, cs, UBIFS_CS_NODE_SZ, 0);
415
416 /*
417 * Note, we do not lock 'c->log_mutex' because this is the commit start
418 * phase and we are exclusively using the log. And we do not lock
419 * write-buffer because nobody can write to the file-system at this
420 * phase.
421 */
422
423 len = UBIFS_CS_NODE_SZ;
424 for (i = 0; i < c->jhead_cnt; i++) {
425 int lnum = c->jheads[i].wbuf.lnum;
426 int offs = c->jheads[i].wbuf.offs;
427
428 if (lnum == -1 || offs == c->leb_size)
429 continue;
430
431 dbg_log("add ref to LEB %d:%d for jhead %d", lnum, offs, i);
432 ref = buf + len;
433 ref->ch.node_type = UBIFS_REF_NODE;
434 ref->lnum = cpu_to_le32(lnum);
435 ref->offs = cpu_to_le32(offs);
436 ref->jhead = cpu_to_le32(i);
437
438 ubifs_prepare_node(c, ref, UBIFS_REF_NODE_SZ, 0);
439 len += UBIFS_REF_NODE_SZ;
440 }
441
442 ubifs_pad(c, buf + len, ALIGN(len, c->min_io_size) - len);
443
444 /* Switch to the next log LEB */
445 if (c->lhead_offs) {
446 c->lhead_lnum = next_log_lnum(c, c->lhead_lnum);
447 c->lhead_offs = 0;
448 }
449
450 if (c->lhead_offs == 0) {
451 /* Must ensure next LEB has been unmapped */
452 err = ubifs_leb_unmap(c, c->lhead_lnum);
453 if (err)
454 goto out;
455 }
456
457 len = ALIGN(len, c->min_io_size);
458 dbg_log("writing commit start at LEB %d:0, len %d", c->lhead_lnum, len);
459 err = ubifs_leb_write(c, c->lhead_lnum, cs, 0, len, UBI_SHORTTERM);
460 if (err)
461 goto out;
462
463 *ltail_lnum = c->lhead_lnum;
464
465 c->lhead_offs += len;
466 if (c->lhead_offs == c->leb_size) {
467 c->lhead_lnum = next_log_lnum(c, c->lhead_lnum);
468 c->lhead_offs = 0;
469 }
470
471 remove_buds(c);
472
473 /*
474 * We have started the commit and now users may use the rest of the log
475 * for new writes.
476 */
477 c->min_log_bytes = 0;
478
479out:
480 kfree(buf);
481 return err;
482}
483
484/**
485 * ubifs_log_end_commit - end commit.
486 * @c: UBIFS file-system description object
487 * @ltail_lnum: new log tail LEB number
488 *
489 * This function is called on when the commit operation was finished. It
490 * moves log tail to new position and unmaps LEBs which contain obsolete data.
491 * Returns zero in case of success and a negative error code in case of
492 * failure.
493 */
494int ubifs_log_end_commit(struct ubifs_info *c, int ltail_lnum)
495{
496 int err;
497
498 /*
499 * At this phase we have to lock 'c->log_mutex' because UBIFS allows FS
500 * writes during commit. Its only short "commit" start phase when
501 * writers are blocked.
502 */
503 mutex_lock(&c->log_mutex);
504
505 dbg_log("old tail was LEB %d:0, new tail is LEB %d:0",
506 c->ltail_lnum, ltail_lnum);
507
508 c->ltail_lnum = ltail_lnum;
509 /*
510 * The commit is finished and from now on it must be guaranteed that
511 * there is always enough space for the next commit.
512 */
513 c->min_log_bytes = c->leb_size;
514
515 spin_lock(&c->buds_lock);
516 c->bud_bytes -= c->cmt_bud_bytes;
517 spin_unlock(&c->buds_lock);
518
519 err = dbg_check_bud_bytes(c);
520
521 mutex_unlock(&c->log_mutex);
522 return err;
523}
524
525/**
526 * ubifs_log_post_commit - things to do after commit is completed.
527 * @c: UBIFS file-system description object
528 * @old_ltail_lnum: old log tail LEB number
529 *
530 * Release buds only after commit is completed, because they must be unchanged
531 * if recovery is needed.
532 *
533 * Unmap log LEBs only after commit is completed, because they may be needed for
534 * recovery.
535 *
536 * This function returns %0 on success and a negative error code on failure.
537 */
538int ubifs_log_post_commit(struct ubifs_info *c, int old_ltail_lnum)
539{
540 int lnum, err = 0;
541
542 while (!list_empty(&c->old_buds)) {
543 struct ubifs_bud *bud;
544
545 bud = list_entry(c->old_buds.next, struct ubifs_bud, list);
546 err = ubifs_return_leb(c, bud->lnum);
547 if (err)
548 return err;
549 list_del(&bud->list);
550 kfree(bud);
551 }
552 mutex_lock(&c->log_mutex);
553 for (lnum = old_ltail_lnum; lnum != c->ltail_lnum;
554 lnum = next_log_lnum(c, lnum)) {
555 dbg_log("unmap log LEB %d", lnum);
556 err = ubifs_leb_unmap(c, lnum);
557 if (err)
558 goto out;
559 }
560out:
561 mutex_unlock(&c->log_mutex);
562 return err;
563}
564
565/**
566 * struct done_ref - references that have been done.
567 * @rb: rb-tree node
568 * @lnum: LEB number
569 */
570struct done_ref {
571 struct rb_node rb;
572 int lnum;
573};
574
575/**
576 * done_already - determine if a reference has been done already.
577 * @done_tree: rb-tree to store references that have been done
578 * @lnum: LEB number of reference
579 *
580 * This function returns %1 if the reference has been done, %0 if not, otherwise
581 * a negative error code is returned.
582 */
583static int done_already(struct rb_root *done_tree, int lnum)
584{
585 struct rb_node **p = &done_tree->rb_node, *parent = NULL;
586 struct done_ref *dr;
587
588 while (*p) {
589 parent = *p;
590 dr = rb_entry(parent, struct done_ref, rb);
591 if (lnum < dr->lnum)
592 p = &(*p)->rb_left;
593 else if (lnum > dr->lnum)
594 p = &(*p)->rb_right;
595 else
596 return 1;
597 }
598
599 dr = kzalloc(sizeof(struct done_ref), GFP_NOFS);
600 if (!dr)
601 return -ENOMEM;
602
603 dr->lnum = lnum;
604
605 rb_link_node(&dr->rb, parent, p);
606 rb_insert_color(&dr->rb, done_tree);
607
608 return 0;
609}
610
611/**
612 * destroy_done_tree - destroy the done tree.
613 * @done_tree: done tree to destroy
614 */
615static void destroy_done_tree(struct rb_root *done_tree)
616{
617 struct rb_node *this = done_tree->rb_node;
618 struct done_ref *dr;
619
620 while (this) {
621 if (this->rb_left) {
622 this = this->rb_left;
623 continue;
624 } else if (this->rb_right) {
625 this = this->rb_right;
626 continue;
627 }
628 dr = rb_entry(this, struct done_ref, rb);
629 this = rb_parent(this);
630 if (this) {
631 if (this->rb_left == &dr->rb)
632 this->rb_left = NULL;
633 else
634 this->rb_right = NULL;
635 }
636 kfree(dr);
637 }
638}
639
640/**
641 * add_node - add a node to the consolidated log.
642 * @c: UBIFS file-system description object
643 * @buf: buffer to which to add
644 * @lnum: LEB number to which to write is passed and returned here
645 * @offs: offset to where to write is passed and returned here
646 * @node: node to add
647 *
648 * This function returns %0 on success and a negative error code on failure.
649 */
650static int add_node(struct ubifs_info *c, void *buf, int *lnum, int *offs,
651 void *node)
652{
653 struct ubifs_ch *ch = node;
654 int len = le32_to_cpu(ch->len), remains = c->leb_size - *offs;
655
656 if (len > remains) {
657 int sz = ALIGN(*offs, c->min_io_size), err;
658
659 ubifs_pad(c, buf + *offs, sz - *offs);
660 err = ubifs_leb_change(c, *lnum, buf, sz, UBI_SHORTTERM);
661 if (err)
662 return err;
663 *lnum = next_log_lnum(c, *lnum);
664 *offs = 0;
665 }
666 memcpy(buf + *offs, node, len);
667 *offs += ALIGN(len, 8);
668 return 0;
669}
670
671/**
672 * ubifs_consolidate_log - consolidate the log.
673 * @c: UBIFS file-system description object
674 *
675 * Repeated failed commits could cause the log to be full, but at least 1 LEB is
676 * needed for commit. This function rewrites the reference nodes in the log
677 * omitting duplicates, and failed CS nodes, and leaving no gaps.
678 *
679 * This function returns %0 on success and a negative error code on failure.
680 */
681int ubifs_consolidate_log(struct ubifs_info *c)
682{
683 struct ubifs_scan_leb *sleb;
684 struct ubifs_scan_node *snod;
685 struct rb_root done_tree = RB_ROOT;
686 int lnum, err, first = 1, write_lnum, offs = 0;
687 void *buf;
688
689 dbg_rcvry("log tail LEB %d, log head LEB %d", c->ltail_lnum,
690 c->lhead_lnum);
691 buf = vmalloc(c->leb_size);
692 if (!buf)
693 return -ENOMEM;
694 lnum = c->ltail_lnum;
695 write_lnum = lnum;
696 while (1) {
697 sleb = ubifs_scan(c, lnum, 0, c->sbuf);
698 if (IS_ERR(sleb)) {
699 err = PTR_ERR(sleb);
700 goto out_free;
701 }
702 list_for_each_entry(snod, &sleb->nodes, list) {
703 switch (snod->type) {
704 case UBIFS_REF_NODE: {
705 struct ubifs_ref_node *ref = snod->node;
706 int ref_lnum = le32_to_cpu(ref->lnum);
707
708 err = done_already(&done_tree, ref_lnum);
709 if (err < 0)
710 goto out_scan;
711 if (err != 1) {
712 err = add_node(c, buf, &write_lnum,
713 &offs, snod->node);
714 if (err)
715 goto out_scan;
716 }
717 break;
718 }
719 case UBIFS_CS_NODE:
720 if (!first)
721 break;
722 err = add_node(c, buf, &write_lnum, &offs,
723 snod->node);
724 if (err)
725 goto out_scan;
726 first = 0;
727 break;
728 }
729 }
730 ubifs_scan_destroy(sleb);
731 if (lnum == c->lhead_lnum)
732 break;
733 lnum = next_log_lnum(c, lnum);
734 }
735 if (offs) {
736 int sz = ALIGN(offs, c->min_io_size);
737
738 ubifs_pad(c, buf + offs, sz - offs);
739 err = ubifs_leb_change(c, write_lnum, buf, sz, UBI_SHORTTERM);
740 if (err)
741 goto out_free;
742 offs = ALIGN(offs, c->min_io_size);
743 }
744 destroy_done_tree(&done_tree);
745 vfree(buf);
746 if (write_lnum == c->lhead_lnum) {
747 ubifs_err("log is too full");
748 return -EINVAL;
749 }
750 /* Unmap remaining LEBs */
751 lnum = write_lnum;
752 do {
753 lnum = next_log_lnum(c, lnum);
754 err = ubifs_leb_unmap(c, lnum);
755 if (err)
756 return err;
757 } while (lnum != c->lhead_lnum);
758 c->lhead_lnum = write_lnum;
759 c->lhead_offs = offs;
760 dbg_rcvry("new log head at %d:%d", c->lhead_lnum, c->lhead_offs);
761 return 0;
762
763out_scan:
764 ubifs_scan_destroy(sleb);
765out_free:
766 destroy_done_tree(&done_tree);
767 vfree(buf);
768 return err;
769}
770
771#ifdef CONFIG_UBIFS_FS_DEBUG
772
773/**
774 * dbg_check_bud_bytes - make sure bud bytes calculation are all right.
775 * @c: UBIFS file-system description object
776 *
777 * This function makes sure the amount of flash space used by closed buds
778 * ('c->bud_bytes' is correct). Returns zero in case of success and %-EINVAL in
779 * case of failure.
780 */
781static int dbg_check_bud_bytes(struct ubifs_info *c)
782{
783 int i, err = 0;
784 struct ubifs_bud *bud;
785 long long bud_bytes = 0;
786
787 if (!(ubifs_chk_flags & UBIFS_CHK_GEN))
788 return 0;
789
790 spin_lock(&c->buds_lock);
791 for (i = 0; i < c->jhead_cnt; i++)
792 list_for_each_entry(bud, &c->jheads[i].buds_list, list)
793 bud_bytes += c->leb_size - bud->start;
794
795 if (c->bud_bytes != bud_bytes) {
796 ubifs_err("bad bud_bytes %lld, calculated %lld",
797 c->bud_bytes, bud_bytes);
798 err = -EINVAL;
799 }
800 spin_unlock(&c->buds_lock);
801
802 return err;
803}
804
805#endif /* CONFIG_UBIFS_FS_DEBUG */
generated by cgit v1.2.2 (git 2.25.0) at 2025-12-09 03:53:20 -0500